Siemens Control Relay: DIN-Rail & Surface Relay Mounting, 110V DC Coil Volt, 2NO/2NC
The SIEMENS IEC Control Relay (MPN 3RH21221BF40) is a combination DIN-rail and surface-mounted relay with a 2NO/2NC contact configuration rated at 10 A and a 110V DC coil voltage. 3G Electric interprets this demand…
SKU 3G-OTH-37256
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Product Description
The SIEMENS IEC Control Relay (MPN 3RH21221BF40) is a combination DIN-rail and surface-mounted relay with a 2NO/2NC contact configuration rated at 10 A and a 110V DC coil voltage. 3G Electric interprets this demand and delivers the genuine Siemens part, backed by specialist expertise across 14 industrial departments — including electrical controls — to ensure you get the right solution, not just a catalog listing.
Frequently Asked Questions
What is the SIEMENS 3RH21221BF40 control relay used for?
The SIEMENS 3RH21221BF40 is an IEC control relay used for switching and isolating electrical circuits in industrial automation, motor control centers, and panel building. Its 2NO/2NC contact configuration and 10 A rating suit general-purpose control applications in manufacturing, energy, and process industries.
What are the specifications of the SIEMENS 3RH21221BF40 relay?
This SIEMENS relay has a 110V DC coil voltage, 2 normally open and 2 normally closed contacts rated at 10 A, and mounts on DIN-rail or surface. The manufacturer part number is 3RH21221BF40. It is designed for IEC control circuits requiring reliable switching in industrial environments.
Where to buy the SIEMENS 3RH21221BF40 relay worldwide?
You can source the SIEMENS 3RH21221BF40 relay through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time; we supply genuine Siemens components for industrial applications.
How to install the SIEMENS 3RH21221BF40 relay on a DIN-rail?
To install the SIEMENS 3RH21221BF40, snap the relay onto a standard 35 mm DIN-rail until it locks. For surface mounting, use the provided screw holes. Ensure the coil voltage matches your 110V DC supply and wire contacts per the 2NO/2NC diagram. Always de-energize circuits before installation.
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Common applications for SiemensSiemens Products
3G Electric supplies Siemens combination din-rail & surface-mounted relays. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
